No, I like the minimum bid increase and it should stay

It's the auction warring over underpriced eggs and items that needs to go. If people are super vocal about (for whatever reason) being able to set a price below the server sellback price then I suppose I'm in the minority. It would be nice if it was indeed a charitable contribution but.. it's just giving free money to a few people, pretty much. Adding eggs to usershops and gifting would be good, I'm not sure why this isn't already a thing!

But no, unfortunately you can't really detect a script plugging a bid in. It's not a complex process, it would be pretty hard to distinguish a bidding script from a person that just refreshes the game all the time and manually adds bids. And even if you were diligent enough to figure it out, people using scripts are likely going to run them off of a proxy server that doesn't come from their account or IP, so there really isn't much way to stop it. It's not a malicious script, you can inspect a lot of the game elements yourself in Chrome with F12 and choosing Sources.

PC inflation is going to happen in any game that generates currency out of nothing. The point isn't to have a real economy, the point is to have fun. But the idea behind a buy/resell mechanic is for people to buy up items at a price and sell them to -other players- for a higher price. It's pretty silly if players can just buy up items at a price and sell them back to the game for a higher price. I'm all for the sell to server mechanic, it just doesn't make sense to let players offer items below the server sellback price. Even new players can afford 18 PC pixpet eggs. Only the rarest eggs go for hundreds or thousands of PC, but you can buy pretty much every other egg for under 50 PC. A few low level hoards earn you that no problem.